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PERHITUNGAN BRONJONG 1. DATA PERENCANAAN 1.1 Dimensi B H L
= = =
3.00 2.50 1.00
m m m (panjang pias)
b1 b2 b3 b4
= = = =
1.00 1.00 0.00 1.00
m m m m
q (t/m)
h5 h4 h3
H = h1
hw
h1 h2 h3 h4 h5
= = = = =
2.50 1.00 0.50 0.50 0.50
h2
m m m m m
b1
b2
b3
b4
B
1.2 Parameter
gm
Tanah 1 = 1.00 t/m2 = 1.50 t/m3
Ø˚
Tanah 2 = 0.00 t/m3 = 0.00 ˚
ɸ˚
=
10.24
˚
gtn
=
0.00
t/m3
gtn
=
1.69
t/m3
c
=
0.000
kg/cm2
C
=
0.254
kg/cm2
q
gm
1.3 Angka keamanan Guling
= Eksentisitas = Geser =
fs |e| fs
> < >
1.5 B/6 1.5
2. PERHITUNGAN STABILITAS q (t/m)
0.50 0.50 Pa1
2.50
1
0.50 2
Pa2
3 4
Pp
Pa1
2.50
1 2 3
Pa2
4
1.00
Pp
1.00
1.00 0.00 1.00 3.00
2.1 Beban vertikal No. b 1.00 1.00 0.00 1.00 0.00
1 2 3 4 q
× × × × × ×
× × × × ×
h 2.50 2.00 1.50 1.00
Uraian g 1.50 1.50 1.50 1.50 1.00
× × × × × ×
Total
L 1.00 1.00 1.00 1.00 1.00
W (t)
X (m)
3.75 3.00 0.00 1.50 0.00 8.25
2.50 1.50 1.00 0.50 0.00
H (t)
Y (m)
1.75 3.69 -1.21 4.22
1.25 0.83 0.33
2.2 Beban horizontal a. Koefesien tanah aktif Ka
=
Ka
=
〖��〗 ^2(45 - (Ø˚)/2) 10.24 〖��〗 ^2(45 - ( )/(2 ) ) 0.70
=
b. Koefesien tanah pasif Kp
=
Kp
= =
qa1
〖��〗 ^2(45 + (Ø˚)/2) 10.24 〖��〗 ^2(45 + ( )/(2 ) ) 1.43
qa2
= Ka × q = Ka × h1
qp
= Kp × h2
× gtn × gtn
=
0.70
ton/m
=
2.95
ton/m
=
-2.42
ton/m
No. Pa1 Pa2 Pp
Uraian q 0.70 2.95 -2.42
× × × ×
y 2.50 2.50 1.00
× × Total
0.50 0.50
2.3 Stabilitas guling ∑ Mv Fs = ∑ Mh 14.63 = 4.85 = 3.02
>
1.5
OK!!
=
0.50
OK!!
2.5 Stabilitas geser (C × B) + (W × tgØ˚) Fs = ∑W 5080.00 + 1490.36 = 3647.69 = 1.80 >
1.50
OK!!
2.4 Eksentisitas X
= = =
|e|
= = =
(∑ W × X) - (∑ H × Y) ∑W 14.63 4.85 8.25 1.18 m B X 2 3.00 1.18 2 0.32 m < B/6
h5 h4 h3
h2
b4
Tanah 2 t/m3 t/m3 kg/cm2
W×X 9.38 4.50 0.00 0.75 0.00 14.63
H×Y 2.18 3.07 -0.40 4.85
